immerstrum
I encountered an incorrect rules interaction today. I was facing an opponent who activated Immerstrum Predator to sacrifice a creature to become indestructible, which destroyed one of their creatures. I then activated Scavenging Ooze in response to remove that creature from their graveyard to get +1/+1. All of that worked correctly.
However, when the stack resolved, Immerstrum Predator gained a +1/+1 as though IT had been the card whose effect chose to remove the aforementioned creature from the graveyard as well. I'm guessing it's just checking if a creature was removed from the graveyard between the time of activation and the time of resolution, which isn't how the text on the card says it should work.
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Rezzahan#77802
commented
Immersturm Predator gets a +1/+1 counter no matter what, if its controler chooses zero cards to exile. So the question is, did your opponent target a card in a graveyard? If yes, was it the card your Ooze exiled?